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Reason for Laboratory Test Screening

Published: August 9, 2026Updated: August 16, 2026

This test is not a specific lab result but rather a record of the clinical reason(s) why a laboratory test was ordered. It helps healthcare providers understand the context for testing.

Quick summary

["This is a documentation tool, not a diagnostic test itself."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
33035-7
Short code
Reason for lab test Smn
Synonyms
Reason for lab test Smn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Does

The 'Reason for Laboratory Test' entry logs the purpose behind ordering specific blood, urine, or other specimen tests. Providers use this information to tailor follow-up care based on the test’s intended use—such as monitoring a condition, diagnosing an illness, or guiding treatment decisions. It does not measure any substance or biological activity but serves as a reference for the clinical workflow.

Who Might Need This

This entry is typically created by healthcare providers when ordering tests for patients, regardless of the patient’s symptoms or diagnosis. It’s part of routine documentation in medical records to ensure continuity of care.

Common Uses in Healthcare

Providers use this information to: - Align test results with suspected diagnoses. - Adjust treatment plans based on test findings. - Track patient progress over time for chronic conditions. It’s not used to interpret results but to contextualize them.

How It Differs from Actual Test Results

Unlike lab tests that measure substances like glucose, cholesterol, or hormones, this entry is a textual note. It does not provide numeric values or reference ranges but simply documents the clinical rationale for testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why would my doctor record the reason for ordering a lab test?
Your doctor records the reason to ensure the test results are used correctly. It helps them connect your test results to your health situation, such as monitoring a condition or checking for a specific issue. This documentation supports accurate diagnosis and treatment planning.
Does this entry affect my test results?
No, the reason for the test is separate from the actual lab results. It’s a note in your medical record that explains why the test was done, not the outcome of the test itself.
Can I see the reason for my lab tests?
Yes, your healthcare provider or medical records team can share the reason for your lab tests with you, if appropriate. This helps you understand why certain tests were ordered and what they might be checking for.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy